Application Formulas

Horsepower

1 hp = 36 lb-in. @ 1750 rpm
1 hp = 3 lb-ft. @ 1750 rpm
hp = Torque (lb-in.) x rpm
63,025
hp = Force (lb) x Velocity (ft/min.)
33,000

Velocity

Velocity (ft/min.) = 0.262 x Dia. (in.) x rpm

Torque

Torque (lb-in.) = Force (lb) x Radius (in.)
Torque (lb-in.) = hp x 63,025
                        rpm

Mechanical Efficiency

Mechanical Efficiency =Output hp
                                                  input hp      x100

Output

Output hp =OT (lb-in.) x Output rpm
            63,025
OT = Input Torque x Ration x Efficiency
OT = Output Torque
Output rpm = Input rpm
                     Ratio

OHL

OHL =2 TK
          D
OHL = Overhung Load (lb)
T = Shaft Torque (lb-in.)
D = PD of sprocket, Pinion or Pully (in.)
K = Overhung Load Factor

OHL Factors

Sprocket or Timing Belt ............. 1.00
Pinion & Gear Drive.................... 1.25
Pully & V-Belt Drive.................... 1.50
Variable Pitch Pulley................... 3.50

Misc.

kW = hp x 0.7457
in. = mm/25.4

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